Twitter is afraid of another investigation and voluntarily reported the hacking to the European Union.

Twitter has taken the initiative to report the incident to the EU’s data protection authority, days after the worst security breach in the company’s history. Graham Doyle, a spokesman for the Irish Data Protection Commission (DPC), the EU’s data protection body, said today that the regulator had been informed of the incident. DPC is the main regulator in the European Union for Twitter and other U.S. technology companies, whose European headquarters are based in Ireland.

Twitter is afraid of another investigation and voluntarily reported the hacking to the European Union.

At the moment, Twitter is grappling with the worst security incident. Twitter announced late Wednesday that hackers had hijacked accounts including Democratic presidential candidate Joe Biden, former President Barack Obama, reality TV star Kim Kardashian and tech billionaire and Tesla founder Elon Musk by gaining control of Twitter employee credentials.

Twitter later said hackers had locked up 130 accounts, controlled 45 of them by resetting passwords and posting “tweets” through them. In addition, Twitter confirmed that the attackers successfully manipulated a small group of internal employees and used their credentials to access Twitter’s internal systems.

In May 2018, the Eu’s new data privacy regulation, the General Data Protection Regulation (GDPR), came into force. In October of the same year, Twitter was investigated in Europe for tracking user data. It is also the first time Twitter has come under investigation since the GDPR came into effect.